/* ========================================
   Common Styles - VisualSVN 中文官网
   ======================================== */

/* CSS Reset & Base */
*, *::before, *::after {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    --color-dark: #272A30;
    --color-deep: #2C2A53;
    --color-primary: #0060DF;
    --color-primary-hover: #0050BF;
    --color-primary-light: #E8F0FE;
    --color-bg: #FFFFFF;
    --color-bg-light: #F7F8FA;
    --color-bg-section: #F0F2F5;
    --color-text: #1A1A2E;
    --color-text-secondary: #5A5E6A;
    --color-text-light: #8A8D97;
    --color-border: #E2E4E8;
    --color-border-light: #ECEDF0;
    --font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Helvetica Neue", Helvetica, Arial, sans-serif;
    --max-width: 1200px;
    --header-height: 72px;
    --radius: 8px;
    --radius-lg: 12px;
    --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.06);
    --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.08);
    --shadow-lg: 0 8px 30px rgba(0, 0, 0, 0.1);
    --transition: all 0.3s ease;
}

html {
    font-size: 16px;
    scroll-behavior: smooth;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

body {
    font-family: var(--font-family);
    color: var(--color-text);
    background-color: var(--color-bg);
    line-height: 1.7;
    overflow-x: hidden;
}

a {
    text-decoration: none;
    color: var(--color-primary);
    transition: var(--transition);
}

a:hover {
    color: var(--color-primary-hover);
}

img {
    max-width: 100%;
    height: auto;
    display: block;
}

.container {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 24px;
}

/* 按钮基础样式 */
.btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 12px 28px;
    border-radius: var(--radius);
    font-size: 15px;
    font-weight: 500;
    cursor: pointer;
    border: none;
    transition: var(--transition);
    text-decoration: none;
    line-height: 1.4;
}

.btn-primary {
    background: var(--color-primary);
    color: #fff;
    box-shadow: 0 2px 8px rgba(0, 96, 223, 0.3);
}

.btn-primary:hover {
    background: var(--color-primary-hover);
    color: #fff;
    box-shadow: 0 4px 16px rgba(0, 96, 223, 0.4);
    transform: translateY(-1px);
}

.btn-outline {
    background: transparent;
    color: var(--color-text);
    border: 1.5px solid var(--color-border);
}

.btn-outline:hover {
    border-color: var(--color-primary);
    color: var(--color-primary);
    background: var(--color-primary-light);
}

/* Section 通用样式 */
.section {
    padding: 80px 0;
}

.section-alt {
    background: var(--color-bg-light);
}

.section-title {
    font-size: 32px;
    font-weight: 700;
    color: var(--color-dark);
    margin-bottom: 16px;
    letter-spacing: -0.02em;
}

.section-subtitle {
    font-size: 17px;
    color: var(--color-text-secondary);
    max-width: 680px;
    line-height: 1.7;
}

/* 产品下拉菜单 */
.nav-dropdown-wrap { position: relative; }
.nav-dropdown-trigger { display: inline-flex; align-items: center; gap: 4px; background: none; border: none; cursor: pointer; font-family: inherit; }
.nav-dropdown-trigger svg { transition: var(--transition); }
.nav-dropdown-wrap.is-open .nav-dropdown-trigger svg { transform: rotate(180deg); }
.nav-dropdown { position: absolute; top: calc(100% + 8px); left: 50%; transform: translateX(-50%); min-width: 300px; background: #fff; border: 1px solid var(--color-border-light); border-radius: 14px; box-shadow: 0 12px 40px rgba(0,0,0,0.12); padding: 8px; opacity: 0; visibility: hidden; transform: translateX(-50%) translateY(-8px); transition: opacity 0.2s ease, transform 0.2s ease, visibility 0.2s; z-index: 100; }
.nav-dropdown-wrap.is-open .nav-dropdown { opacity: 1; visibility: visible; transform: translateX(-50%) translateY(0); }
.nav-dropdown-item { display: flex; align-items: center; gap: 12px; padding: 12px 14px; border-radius: 10px; text-decoration: none; transition: var(--transition); }
.nav-dropdown-item:hover { background: var(--color-bg-light); }
.nav-dropdown-icon { width: 32px; height: 32px; border-radius: 8px; object-fit: contain; flex-shrink: 0; }
.nav-dropdown-text { display: flex; flex-direction: column; }
.nav-dropdown-name { font-size: 14px; font-weight: 600; color: var(--color-dark); }
.nav-dropdown-desc { font-size: 11px; color: var(--color-text-light); margin-top: 1px; }
@media (max-width: 768px) {
    .nav-dropdown { position: static; transform: none; min-width: auto; box-shadow: none; border: 1px solid var(--color-border-light); border-radius: 10px; margin-top: 4px; margin-bottom: 4px; opacity: 1; visibility: visible; display: none; }
    .nav-dropdown-wrap.is-open .nav-dropdown { display: block; transform: none; }
}

/* 响应式 */
@media (max-width: 768px) {
    :root {
        --header-height: 64px;
    }

    .container {
        padding: 0 16px;
    }

    .section {
        padding: 56px 0;
    }

    .section-title {
        font-size: 26px;
    }

    .section-subtitle {
        font-size: 15px;
    }

    .btn {
        padding: 10px 22px;
        font-size: 14px;
    }
}

@media (max-width: 480px) {
    .section {
        padding: 40px 0;
    }

    .section-title {
        font-size: 22px;
    }
}